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A U.N. human rights official accused Israel on Friday of mistreating Palestinian detainees in Gaza, saying he had met men who had described being held for weeks, beaten and blindfolded, with some released in diapers.

Ajith Sunghay, a U.N. human rights official in Gaza, told reporters it was not clear exactly how many men had been detained by Israel since it began its war on Gaza, but he said the number ran into the thousands.

"These are men who were detained by the Israeli security forces in unknown locations for between 30 to 55 days," Sunghay told reporters in Geneva by video link from Gaza. He said he had just met released detainees in the besieged enclave.

"There are reports of men who are subsequently released, but only in diapers without any adequate clothing in this cold weather," he added.

Israel's military and government spokespeople were not immediately available for comment. The Israeli military spokesperson's office has previously said its forces are operating "to dismantle Hamas' military capabilities" and rescue hostages captured by the Palestinian group.

Asked to elaborate on why some of the released detainees wore diapers, Sunghay said: "So we're not exactly sure why they were put in diapers and sent out but they were clearly visibly shocked and even shaken when I met them."

Israeli TV broadcast footage in December of Palestinian men stripped to their underwear in Gaza. The images that also circulated on social media drew condemnation from Palestinian, Arab and Muslim officials.

At the time, Israeli government spokesperson Eylon Levy said the images showed "military-age men who were discovered in areas that civilians were supposed to have evacuated weeks ago".